Lost one of 2 chicks suddenly at 9 weeks; should I keep preventatively treating the other for cocci despite no symptoms?

Christabean

Songster
5 Years
Jun 21, 2016
88
73
127
California
Hello and thanks in advance! I'm sorry for the excessive detail but since I don't know what might be relevant... Question in bold below if you want to skip to the point!

We had two seemingly healthy chicks since late January, from about 10 days old. They turned 9 weeks last week. One black sexlink (Eggy Sue) and one Barred Rock (Egglantine). This is our fourth time raising baby chicks, 2-4 at a time, so we're not too clueless. They had appropriate heat for the first few weeks (mama heating pad), clean water and food and bedding. They had been drinking plain water and eating a good-quality non-medicated feed. Both were vaccinated for Marek's. We have a small healthy outdoor flock ranging from 3-6 years old so outdoor contamination is theoretically possible, but not likely as we had NOT taken the chicks outdoors at all yet. We wash hands between caring for the big girls and babies (don't sanitize shoes though). The big girls are all thankfully fine and healthy.

On Friday Eggy Sue just didn't get up in the morning. We moved her to a small box with food and water (with Rooster Booster) within beak's reach but she died within 3 hours of discovery. No wounds or obvious symptoms, she had a little strength in her legs but not much, droopy neck and closed eyes but not hanging sideways or anything. She didn't seem underweight. No labored breathing or sounds. Her legs looked normal color. Her comb might have been pale but at 9 weeks they're pale anyway. She had seemingly been eating and drinking and pooping normally as recently as the previous evening. (The towel she was on in her final hours was still clean.)

I cleaned and sanitized the brooder after Eggy Sue passed and there might have been a couple questionable cecal poops during the week since previous cleaning; no definite blood or diarrhea or anything alarming though. We put Egglantine on Rooster Booster and ACV for a couple days while I ordered CORID/amprolium just in case, because I read that cocci is the most common chick killer and risks are low for treating preventively. The CORID arrived Sunday and I started Egglantine on it, she's on day 3 of treatment. I've been monitoring her poops and they have seemed fine this whole time.

My question is, after the 5 days initial treatment of CORID (2 tsp/gallon of liquid version), should I do the additional 7 days of half-strength (1 tsp/gallon) or do you think I'm better off switching back to vitamins since we don't really know if they had cocci? (We decided against necropsy due to cost and emotional toll of freezing and preparing her body; she was my son's pet.) I'm now wondering if she needs the vitamins more than medicine since I'm hearing vitamin deficiencies can also cause weakness. They were on a good organic feed (Modesto Milling, which our chickens have done well on) though.

Thank your for your experience and advice!
 
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I'm sorry to hear one died.

Can you post some photos of Egglantine and her poop?

How is she acting? Is she eating/drinking ok?

You are giving Corid only, no ACV or Rooster Booster with the Corid right?

IF she's acting pretty normal after the 5-7 days initial treatment of Corid, then switch to giving some probiotics and vitamins for a few days. See how it goes.
Some folks give Corid, then vitamins, then the lower rate of Corid - split it up.
 
Thanks guys! She is still looking good and yes, I did see that nothing else should be given with the CORID. I'll discontinue after 5 days and resume vitamins and ACV. Somewhere else I had seen that a second week at a reduced dose was needed, but it seems like just 5 days is more standard. Here are photos of her and her poop from day 1.
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IMG_2782.JPG
 
My last batch of chicks got cocci when I moved them outside. After the initial dosing period on corid I waited a few days and kept an eye on their droppings. I saw a few questionable ones so did the second dose. They are grown and running around laying eggs now :)
 

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